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【Вентиляция и кондиционирование】Одно задание в день 20171201

2017-12-02View Original

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Для герметичных краткосрочных труб, проходящих через стены, таких как водопроводные и канализационные трубы под давлением, следует использовать стальные трубы с толщиной стенки более ( ) мм. А, 3 Б, 4 В, 5 Г, 6

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